Table 2. Shock level chosen and Unconditioned response of sample divided by sex and site with ttest comparison between PR and MA (ethnic) and between females and males (sex) at each site.

Shock Measures	PR females Mean (s.d.)	MA females Mean (s.d.)	PR males Mean (s.d.)	MA males Mean (s.d.)	ttest Ethnic Comparison (PR vs MA)		ttest Sex Comparison (females vs males)
					females	males	PR	MA
Shock level chosen	2.87 (1.11)	1.68 (0.87)	2.66(0.99)	3.07(1.05)	0.004	0.229	0.543	<0.001
Unconditioned response (UCR)	0.85 (0.70)	0.86 (0.99)	1.01 (0.58)	1.36 (1.12)	0.992	0.230	0.481	0.147